﻿<html>
<head>
  <title><hr/>标签的基本用法</title>
</head>
<body>
  <p>天地环保业务简介</p>
  <hr />
  <p align="left">环境监测</p>
  <hr color="red"align="left"size="4"width="200"/>
  <p align="center">环境治理</p>
  <hr color="#0000ff"   align="right"  size="1"
width="50%/">
  <p align="right">环境保护</p>
</body>
</html>